I was told before 33 or 36 weeks (can't remember which) to come in if they were ten minutes apart
and after 36 weeks when they are 3-5 min apart
. If you're only 25.6 weeks, and you're having more than four an hour, I'd go get checked, and stay off your feet as much as possible. I was working a lot of hours as a waitress, always on my feet, that's why I had so many, I got my hours cut back to four a day at twenty five weeks, and I was supposed to take breaks and sit every so often.